http://bugs.winehq.org/show_bug.cgi?id=16121
--- Comment #5 from Rosanne DiMesio dimesio@earthlink.net 2009-06-03 18:38:48 --- I'm seeing it now too in 1.1.22 for some fonts.
Based on the dozen or so fonts I checked, it seems to affect only fonts that don't have a separate file for the bold version. In Windows, Office apps can still bold these fonts.
This also affects Word 2007, Powerpoint 2003 & 2007, and Excel 2003 & 2007.